https://unrulyguides.com/2011/06/how-to-convert-epub-to-azw-kindle-in-one-step/
Convert EPUB for e-publishing to Kindle MOBI format
There's been a lot of questions on how to convert an EPUB file to Kindle, and vise-versa. Actually you only need one file, the EPUB, and it will work for both.
publishing to kindleconvertepubmobiformat